ssl/ssl_cert.c

   1 /*
   2  * Copyright 1995-2022 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
   4  *
   5  * Licensed under the Apache License 2.0 (the "License").  You may not use
   6  * this file except in compliance with the License.  You can obtain a copy
   7  * in the file LICENSE in the source distribution or at
   8  * https://www.openssl.org/source/license.html
   9  */
  10
  11 #include <stdio.h>
  12 #include <sys/types.h>
  13
  14 #include "internal/nelem.h"
  15 #include "internal/o_dir.h"
  16 #include <openssl/bio.h>
  17 #include <openssl/pem.h>
  18 #include <openssl/store.h>
  19 #include <openssl/x509v3.h>
  20 #include <openssl/dh.h>
  21 #include <openssl/bn.h>
  22 #include <openssl/crypto.h>
  23 #include "internal/refcount.h"
  24 #include "ssl_local.h"
  25 #include "ssl_cert_table.h"
  26 #include "internal/thread_once.h"
  27 #ifndef OPENSSL_NO_POSIX_IO
  28 # include <sys/stat.h>
  29 # ifdef _WIN32
  30 #  define stat _stat
  31 # endif
  32 #endif
  33
  34 #ifndef S_ISDIR
  35 # define S_ISDIR(a) (((a) & S_IFMT) == S_IFDIR)
  36 #endif
  37
  38 static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
  39                                          int op, int bits, int nid, void *other,
  40                                          void *ex);
  41
  42 static CRYPTO_ONCE ssl_x509_store_ctx_once = CRYPTO_ONCE_STATIC_INIT;
  43 static volatile int ssl_x509_store_ctx_idx = -1;
  44
  45 DEFINE_RUN_ONCE_STATIC(ssl_x509_store_ctx_init)
  46 {
  47     ssl_x509_store_ctx_idx = X509_STORE_CTX_get_ex_new_index(0,
  48                                                              "SSL for verify callback",
  49                                                              NULL, NULL, NULL);
  50     return ssl_x509_store_ctx_idx >= 0;
  51 }
  52
  53 int SSL_get_ex_data_X509_STORE_CTX_idx(void)
  54 {
  55
  56     if (!RUN_ONCE(&ssl_x509_store_ctx_once, ssl_x509_store_ctx_init))
  57         return -1;
  58     return ssl_x509_store_ctx_idx;
  59 }
  60
  61 CERT *ssl_cert_new(size_t ssl_pkey_num)
  62 {
  63     CERT *ret = NULL;
  64
  65     /* Should never happen */
  66     if (!ossl_assert(ssl_pkey_num >= SSL_PKEY_NUM))
  67         return NULL;
  68
  69     ret = OPENSSL_zalloc(sizeof(*ret));
  70     if (ret == NULL)
  71         return NULL;
  72
  73     ret->ssl_pkey_num = ssl_pkey_num;
  74     ret->pkeys = OPENSSL_zalloc(ret->ssl_pkey_num * sizeof(CERT_PKEY));
  75     if (ret->pkeys == NULL) {
  76         OPENSSL_free(ret);
  77         return NULL;
  78     }
  79
  80     ret->key = &(ret->pkeys[SSL_PKEY_RSA]);
  81     ret->references = 1;
  82     ret->sec_cb = ssl_security_default_callback;
  83     ret->sec_level = OPENSSL_TLS_SECURITY_LEVEL;
  84     ret->sec_ex = NULL;
  85     ret->lock = CRYPTO_THREAD_lock_new();
  86     if (ret->lock == NULL) {
  87         ERR_raise(ERR_LIB_SSL, ERR_R_CRYPTO_LIB);
  88         OPENSSL_free(ret->pkeys);
  89         OPENSSL_free(ret);
  90         return NULL;
  91     }
  92
  93     return ret;
  94 }
  95
  96 CERT *ssl_cert_dup(CERT *cert)
  97 {
  98     CERT *ret = OPENSSL_zalloc(sizeof(*ret));
  99     size_t i;
 100 #ifndef OPENSSL_NO_COMP_ALG
 101     int j;
 102 #endif
 103
 104     if (ret == NULL)
 105         return NULL;
 106
 107     ret->ssl_pkey_num = cert->ssl_pkey_num;
 108     ret->pkeys = OPENSSL_zalloc(ret->ssl_pkey_num * sizeof(CERT_PKEY));
 109     if (ret->pkeys == NULL)
 110         return NULL;
 111
 112     ret->references = 1;
 113     ret->key = &ret->pkeys[cert->key - cert->pkeys];
 114     ret->lock = CRYPTO_THREAD_lock_new();
 115     if (ret->lock == NULL) {
 116         ERR_raise(ERR_LIB_SSL, ERR_R_CRYPTO_LIB);
 117         OPENSSL_free(ret);
 118         return NULL;
 119     }
 120
 121     if (cert->dh_tmp != NULL) {
 122         ret->dh_tmp = cert->dh_tmp;
 123         EVP_PKEY_up_ref(ret->dh_tmp);
 124     }
 125
 126     ret->dh_tmp_cb = cert->dh_tmp_cb;
 127     ret->dh_tmp_auto = cert->dh_tmp_auto;
 128
 129     for (i = 0; i < ret->ssl_pkey_num; i++) {
 130         CERT_PKEY *cpk = cert->pkeys + i;
 131         CERT_PKEY *rpk = ret->pkeys + i;
 132
 133         if (cpk->x509 != NULL) {
 134             rpk->x509 = cpk->x509;
 135             X509_up_ref(rpk->x509);
 136         }
 137
 138         if (cpk->privatekey != NULL) {
 139             rpk->privatekey = cpk->privatekey;
 140             EVP_PKEY_up_ref(cpk->privatekey);
 141         }
 142
 143         if (cpk->chain) {
 144             rpk->chain = X509_chain_up_ref(cpk->chain);
 145             if (!rpk->chain) {
 146                 ERR_raise(ERR_LIB_SSL, ERR_R_X509_LIB);
 147                 goto err;
 148             }
 149         }
 150         if (cpk->serverinfo != NULL) {
 151             /* Just copy everything. */
 152             rpk->serverinfo = OPENSSL_memdup(cpk->serverinfo, cpk->serverinfo_length);
 153             if (rpk->serverinfo == NULL)
 154                 goto err;
 155             rpk->serverinfo_length = cpk->serverinfo_length;
 156         }
 157 #ifndef OPENSSL_NO_COMP_ALG
 158         for (j = TLSEXT_comp_cert_none; j < TLSEXT_comp_cert_limit; j++) {
 159             if (cpk->comp_cert[j] != NULL) {
 160                 if (!OSSL_COMP_CERT_up_ref(cpk->comp_cert[j]))
 161                     goto err;
 162                 rpk->comp_cert[j] = cpk->comp_cert[j];
 163             }
 164         }
 165 #endif
 166     }
 167
 168     /* Configured sigalgs copied across */
 169     if (cert->conf_sigalgs) {
 170         ret->conf_sigalgs = OPENSSL_malloc(cert->conf_sigalgslen
 171                                            * sizeof(*cert->conf_sigalgs));
 172         if (ret->conf_sigalgs == NULL)
 173             goto err;
 174         memcpy(ret->conf_sigalgs, cert->conf_sigalgs,
 175                cert->conf_sigalgslen * sizeof(*cert->conf_sigalgs));
 176         ret->conf_sigalgslen = cert->conf_sigalgslen;
 177     } else
 178         ret->conf_sigalgs = NULL;
 179
 180     if (cert->client_sigalgs) {
 181         ret->client_sigalgs = OPENSSL_malloc(cert->client_sigalgslen
 182                                              * sizeof(*cert->client_sigalgs));
 183         if (ret->client_sigalgs == NULL)
 184             goto err;
 185         memcpy(ret->client_sigalgs, cert->client_sigalgs,
 186                cert->client_sigalgslen * sizeof(*cert->client_sigalgs));
 187         ret->client_sigalgslen = cert->client_sigalgslen;
 188     } else
 189         ret->client_sigalgs = NULL;
 190     /* Copy any custom client certificate types */
 191     if (cert->ctype) {
 192         ret->ctype = OPENSSL_memdup(cert->ctype, cert->ctype_len);
 193         if (ret->ctype == NULL)
 194             goto err;
 195         ret->ctype_len = cert->ctype_len;
 196     }
 197
 198     ret->cert_flags = cert->cert_flags;
 199
 200     ret->cert_cb = cert->cert_cb;
 201     ret->cert_cb_arg = cert->cert_cb_arg;
 202
 203     if (cert->verify_store) {
 204         X509_STORE_up_ref(cert->verify_store);
 205         ret->verify_store = cert->verify_store;
 206     }
 207
 208     if (cert->chain_store) {
 209         X509_STORE_up_ref(cert->chain_store);
 210         ret->chain_store = cert->chain_store;
 211     }
 212
 213     ret->sec_cb = cert->sec_cb;
 214     ret->sec_level = cert->sec_level;
 215     ret->sec_ex = cert->sec_ex;
 216
 217     if (!custom_exts_copy(&ret->custext, &cert->custext))
 218         goto err;
 219 #ifndef OPENSSL_NO_PSK
 220     if (cert->psk_identity_hint) {
 221         ret->psk_identity_hint = OPENSSL_strdup(cert->psk_identity_hint);
 222         if (ret->psk_identity_hint == NULL)
 223             goto err;
 224     }
 225 #endif
 226     return ret;
 227
 228  err:
 229     ssl_cert_free(ret);
 230
 231     return NULL;
 232 }
 233
 234 /* Free up and clear all certificates and chains */
 235
 236 void ssl_cert_clear_certs(CERT *c)
 237 {
 238     size_t i;
 239 #ifndef OPENSSL_NO_COMP_ALG
 240     int j;
 241 #endif
 242
 243     if (c == NULL)
 244         return;
 245     for (i = 0; i < c->ssl_pkey_num; i++) {
 246         CERT_PKEY *cpk = c->pkeys + i;
 247         X509_free(cpk->x509);
 248         cpk->x509 = NULL;
 249         EVP_PKEY_free(cpk->privatekey);
 250         cpk->privatekey = NULL;
 251         OSSL_STACK_OF_X509_free(cpk->chain);
 252         cpk->chain = NULL;
 253         OPENSSL_free(cpk->serverinfo);
 254         cpk->serverinfo = NULL;
 255         cpk->serverinfo_length = 0;
 256 #ifndef OPENSSL_NO_COMP_ALG
 257         for (j = 0; j < TLSEXT_comp_cert_limit; j++) {
 258             OSSL_COMP_CERT_free(cpk->comp_cert[j]);
 259             cpk->comp_cert[j] = NULL;
 260             cpk->cert_comp_used = 0;
 261         }
 262 #endif
 263     }
 264 }
 265
 266 void ssl_cert_free(CERT *c)
 267 {
 268     int i;
 269
 270     if (c == NULL)
 271         return;
 272     CRYPTO_DOWN_REF(&c->references, &i, c->lock);
 273     REF_PRINT_COUNT("CERT", c);
 274     if (i > 0)
 275         return;
 276     REF_ASSERT_ISNT(i < 0);
 277
 278     EVP_PKEY_free(c->dh_tmp);
 279
 280     ssl_cert_clear_certs(c);
 281     OPENSSL_free(c->conf_sigalgs);
 282     OPENSSL_free(c->client_sigalgs);
 283     OPENSSL_free(c->ctype);
 284     X509_STORE_free(c->verify_store);
 285     X509_STORE_free(c->chain_store);
 286     custom_exts_free(&c->custext);
 287 #ifndef OPENSSL_NO_PSK
 288     OPENSSL_free(c->psk_identity_hint);
 289 #endif
 290     OPENSSL_free(c->pkeys);
 291     CRYPTO_THREAD_lock_free(c->lock);
 292     OPENSSL_free(c);
 293 }
 294
 295 int ssl_cert_set0_chain(SSL_CONNECTION *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
 296 {
 297     int i, r;
 298     CERT_PKEY *cpk = s != NULL ? s->cert->key : ctx->cert->key;
 299
 300     if (!cpk)
 301         return 0;
 302     for (i = 0; i < sk_X509_num(chain); i++) {
 303         X509 *x = sk_X509_value(chain, i);
 304
 305         r = ssl_security_cert(s, ctx, x, 0, 0);
 306         if (r != 1) {
 307             ERR_raise(ERR_LIB_SSL, r);
 308             return 0;
 309         }
 310     }
 311     OSSL_STACK_OF_X509_free(cpk->chain);
 312     cpk->chain = chain;
 313     return 1;
 314 }
 315
 316 int ssl_cert_set1_chain(SSL_CONNECTION *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
 317 {
 318     STACK_OF(X509) *dchain;
 319
 320     if (!chain)
 321         return ssl_cert_set0_chain(s, ctx, NULL);
 322     dchain = X509_chain_up_ref(chain);
 323     if (!dchain)
 324         return 0;
 325     if (!ssl_cert_set0_chain(s, ctx, dchain)) {
 326         OSSL_STACK_OF_X509_free(dchain);
 327         return 0;
 328     }
 329     return 1;
 330 }
 331
 332 int ssl_cert_add0_chain_cert(SSL_CONNECTION *s, SSL_CTX *ctx, X509 *x)
 333 {
 334     int r;
 335     CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
 336
 337     if (!cpk)
 338         return 0;
 339     r = ssl_security_cert(s, ctx, x, 0, 0);
 340     if (r != 1) {
 341         ERR_raise(ERR_LIB_SSL, r);
 342         return 0;
 343     }
 344     if (!cpk->chain)
 345         cpk->chain = sk_X509_new_null();
 346     if (!cpk->chain || !sk_X509_push(cpk->chain, x))
 347         return 0;
 348     return 1;
 349 }
 350
 351 int ssl_cert_add1_chain_cert(SSL_CONNECTION *s, SSL_CTX *ctx, X509 *x)
 352 {
 353     if (!ssl_cert_add0_chain_cert(s, ctx, x))
 354         return 0;
 355     X509_up_ref(x);
 356     return 1;
 357 }
 358
 359 int ssl_cert_select_current(CERT *c, X509 *x)
 360 {
 361     size_t i;
 362
 363     if (x == NULL)
 364         return 0;
 365     for (i = 0; i < c->ssl_pkey_num; i++) {
 366         CERT_PKEY *cpk = c->pkeys + i;
 367         if (cpk->x509 == x && cpk->privatekey) {
 368             c->key = cpk;
 369             return 1;
 370         }
 371     }
 372
 373     for (i = 0; i < c->ssl_pkey_num; i++) {
 374         CERT_PKEY *cpk = c->pkeys + i;
 375         if (cpk->privatekey && cpk->x509 && !X509_cmp(cpk->x509, x)) {
 376             c->key = cpk;
 377             return 1;
 378         }
 379     }
 380     return 0;
 381 }
 382
 383 int ssl_cert_set_current(CERT *c, long op)
 384 {
 385     size_t i, idx;
 386
 387     if (!c)
 388         return 0;
 389     if (op == SSL_CERT_SET_FIRST)
 390         idx = 0;
 391     else if (op == SSL_CERT_SET_NEXT) {
 392         idx = (size_t)(c->key - c->pkeys + 1);
 393         if (idx >= c->ssl_pkey_num)
 394             return 0;
 395     } else
 396         return 0;
 397     for (i = idx; i < c->ssl_pkey_num; i++) {
 398         CERT_PKEY *cpk = c->pkeys + i;
 399         if (cpk->x509 && cpk->privatekey) {
 400             c->key = cpk;
 401             return 1;
 402         }
 403     }
 404     return 0;
 405 }
 406
 407 void ssl_cert_set_cert_cb(CERT *c, int (*cb) (SSL *ssl, void *arg), void *arg)
 408 {
 409     c->cert_cb = cb;
 410     c->cert_cb_arg = arg;
 411 }
 412
 413 /*
 414  * Verify a certificate chain
 415  * Return codes:
 416  *  1: Verify success
 417  *  0: Verify failure or error
 418  * -1: Retry required
 419  */
 420 int ssl_verify_cert_chain(SSL_CONNECTION *s, STACK_OF(X509) *sk)
 421 {
 422     X509 *x;
 423     int i = 0;
 424     X509_STORE *verify_store;
 425     X509_STORE_CTX *ctx = NULL;
 426     X509_VERIFY_PARAM *param;
 427     SSL_CTX *sctx;
 428
 429     if ((sk == NULL) || (sk_X509_num(sk) == 0))
 430         return 0;
 431
 432     sctx = SSL_CONNECTION_GET_CTX(s);
 433     if (s->cert->verify_store)
 434         verify_store = s->cert->verify_store;
 435     else
 436         verify_store = sctx->cert_store;
 437
 438     ctx = X509_STORE_CTX_new_ex(sctx->libctx, sctx->propq);
 439     if (ctx == NULL) {
 440         ERR_raise(ERR_LIB_SSL, ERR_R_X509_LIB);
 441         return 0;
 442     }
 443
 444     x = sk_X509_value(sk, 0);
 445     if (!X509_STORE_CTX_init(ctx, verify_store, x, sk)) {
 446         ERR_raise(ERR_LIB_SSL, ERR_R_X509_LIB);
 447         goto end;
 448     }
 449     param = X509_STORE_CTX_get0_param(ctx);
 450     /*
 451      * XXX: Separate @AUTHSECLEVEL and @TLSSECLEVEL would be useful at some
 452      * point, for now a single @SECLEVEL sets the same policy for TLS crypto
 453      * and PKI authentication.
 454      */
 455     X509_VERIFY_PARAM_set_auth_level(param,
 456         SSL_get_security_level(SSL_CONNECTION_GET_SSL(s)));
 457
 458     /* Set suite B flags if needed */
 459     X509_STORE_CTX_set_flags(ctx, tls1_suiteb(s));
 460     if (!X509_STORE_CTX_set_ex_data(ctx,
 461             SSL_get_ex_data_X509_STORE_CTX_idx(), s)) {
 462         goto end;
 463     }
 464
 465     /* Verify via DANE if enabled */
 466     if (DANETLS_ENABLED(&s->dane))
 467         X509_STORE_CTX_set0_dane(ctx, &s->dane);
 468
 469     /*
 470      * We need to inherit the verify parameters. These can be determined by
 471      * the context: if its a server it will verify SSL client certificates or
 472      * vice versa.
 473      */
 474
 475     X509_STORE_CTX_set_default(ctx, s->server ? "ssl_client" : "ssl_server");
 476     /*
 477      * Anything non-default in "s->param" should overwrite anything in the ctx.
 478      */
 479     X509_VERIFY_PARAM_set1(param, s->param);
 480
 481     if (s->verify_callback)
 482         X509_STORE_CTX_set_verify_cb(ctx, s->verify_callback);
 483
 484     if (sctx->app_verify_callback != NULL) {
 485         i = sctx->app_verify_callback(ctx, sctx->app_verify_arg);
 486     } else {
 487         i = X509_verify_cert(ctx);
 488         /* We treat an error in the same way as a failure to verify */
 489         if (i < 0)
 490             i = 0;
 491     }
 492
 493     s->verify_result = X509_STORE_CTX_get_error(ctx);
 494     OSSL_STACK_OF_X509_free(s->verified_chain);
 495     s->verified_chain = NULL;
 496     if (X509_STORE_CTX_get0_chain(ctx) != NULL) {
 497         s->verified_chain = X509_STORE_CTX_get1_chain(ctx);
 498         if (s->verified_chain == NULL) {
 499             ERR_raise(ERR_LIB_SSL, ERR_R_X509_LIB);
 500             i = 0;
 501         }
 502     }
 503
 504     /* Move peername from the store context params to the SSL handle's */
 505     X509_VERIFY_PARAM_move_peername(s->param, param);
 506
 507  end:
 508     X509_STORE_CTX_free(ctx);
 509     return i;
 510 }
 511
 512 static void set0_CA_list(STACK_OF(X509_NAME) **ca_list,
 513                         STACK_OF(X509_NAME) *name_list)
 514 {
 515     sk_X509_NAME_pop_free(*ca_list, X509_NAME_free);
 516     *ca_list = name_list;
 517 }
 518
 519 STACK_OF(X509_NAME) *SSL_dup_CA_list(const STACK_OF(X509_NAME) *sk)
 520 {
 521     int i;
 522     const int num = sk_X509_NAME_num(sk);
 523     STACK_OF(X509_NAME) *ret;
 524     X509_NAME *name;
 525
 526     ret = sk_X509_NAME_new_reserve(NULL, num);
 527     if (ret == NULL) {
 528         ERR_raise(ERR_LIB_SSL, ERR_R_CRYPTO_LIB);
 529         return NULL;
 530     }
 531     for (i = 0; i < num; i++) {
 532         name = X509_NAME_dup(sk_X509_NAME_value(sk, i));
 533         if (name == NULL) {
 534             ERR_raise(ERR_LIB_SSL, ERR_R_X509_LIB);
 535             sk_X509_NAME_pop_free(ret, X509_NAME_free);
 536             return NULL;
 537         }
 538         sk_X509_NAME_push(ret, name);   /* Cannot fail after reserve call */
 539     }
 540     return ret;
 541 }
 542
 543 void SSL_set0_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
 544 {
 545     SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
 546
 547     if (sc == NULL)
 548         return;
 549
 550     set0_CA_list(&sc->ca_names, name_list);
 551 }
 552
 553 void SSL_CTX_set0_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
 554 {
 555     set0_CA_list(&ctx->ca_names, name_list);
 556 }
 557
 558 const STACK_OF(X509_NAME) *SSL_CTX_get0_CA_list(const SSL_CTX *ctx)
 559 {
 560     return ctx->ca_names;
 561 }
 562
 563 const STACK_OF(X509_NAME) *SSL_get0_CA_list(const SSL *s)
 564 {
 565     const SSL_CONNECTION *sc = SSL_CONNECTION_FROM_CONST_SSL(s);
 566
 567     if (sc == NULL)
 568         return NULL;
 569
 570     return sc->ca_names != NULL ? sc->ca_names : s->ctx->ca_names;
 571 }
 572
 573 void SSL_CTX_set_client_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
 574 {
 575     set0_CA_list(&ctx->client_ca_names, name_list);
 576 }
 577
 578 STACK_OF(X509_NAME) *SSL_CTX_get_client_CA_list(const SSL_CTX *ctx)
 579 {
 580     return ctx->client_ca_names;
 581 }
 582
 583 void SSL_set_client_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
 584 {
 585     SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
 586
 587     if (sc == NULL)
 588         return;
 589
 590     set0_CA_list(&sc->client_ca_names, name_list);
 591 }
 592
 593 const STACK_OF(X509_NAME) *SSL_get0_peer_CA_list(const SSL *s)
 594 {
 595     const SSL_CONNECTION *sc = SSL_CONNECTION_FROM_CONST_SSL(s);
 596
 597     if (sc == NULL)
 598         return NULL;
 599
 600     return sc->s3.tmp.peer_ca_names;
 601 }
 602
 603 STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *s)
 604 {
 605     const SSL_CONNECTION *sc = SSL_CONNECTION_FROM_CONST_SSL(s);
 606
 607     if (sc == NULL)
 608         return NULL;
 609
 610     if (!sc->server)
 611         return sc->s3.tmp.peer_ca_names;
 612     return sc->client_ca_names != NULL ? sc->client_ca_names
 613                                        : s->ctx->client_ca_names;
 614 }
 615
 616 static int add_ca_name(STACK_OF(X509_NAME) **sk, const X509 *x)
 617 {
 618     X509_NAME *name;
 619
 620     if (x == NULL)
 621         return 0;
 622     if (*sk == NULL && ((*sk = sk_X509_NAME_new_null()) == NULL))
 623         return 0;
 624
 625     if ((name = X509_NAME_dup(X509_get_subject_name(x))) == NULL)
 626         return 0;
 627
 628     if (!sk_X509_NAME_push(*sk, name)) {
 629         X509_NAME_free(name);
 630         return 0;
 631     }
 632     return 1;
 633 }
 634
 635 int SSL_add1_to_CA_list(SSL *ssl, const X509 *x)
 636 {
 637     SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(ssl);
 638
 639     if (sc == NULL)
 640         return 0;
 641
 642     return add_ca_name(&sc->ca_names, x);
 643 }
 644
 645 int SSL_CTX_add1_to_CA_list(SSL_CTX *ctx, const X509 *x)
 646 {
 647     return add_ca_name(&ctx->ca_names, x);
 648 }
 649
 650 /*
 651  * The following two are older names are to be replaced with
 652  * SSL(_CTX)_add1_to_CA_list
 653  */
 654 int SSL_add_client_CA(SSL *ssl, X509 *x)
 655 {
 656     SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(ssl);
 657
 658     if (sc == NULL)
 659         return 0;
 660
 661     return add_ca_name(&sc->client_ca_names, x);
 662 }
 663
 664 int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x)
 665 {
 666     return add_ca_name(&ctx->client_ca_names, x);
 667 }
 668
 669 static int xname_cmp(const X509_NAME *a, const X509_NAME *b)
 670 {
 671     unsigned char *abuf = NULL, *bbuf = NULL;
 672     int alen, blen, ret;
 673
 674     /* X509_NAME_cmp() itself casts away constness in this way, so
 675      * assume it's safe:
 676      */
 677     alen = i2d_X509_NAME((X509_NAME *)a, &abuf);
 678     blen = i2d_X509_NAME((X509_NAME *)b, &bbuf);
 679
 680     if (alen < 0 || blen < 0)
 681         ret = -2;
 682     else if (alen != blen)
 683         ret = alen - blen;
 684     else /* alen == blen */
 685         ret = memcmp(abuf, bbuf, alen);
 686
 687     OPENSSL_free(abuf);
 688     OPENSSL_free(bbuf);
 689
 690     return ret;
 691 }
 692
 693 static int xname_sk_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
 694 {
 695     return xname_cmp(*a, *b);
 696 }
 697
 698 static unsigned long xname_hash(const X509_NAME *a)
 699 {
 700     /* This returns 0 also if SHA1 is not available */
 701     return X509_NAME_hash_ex((X509_NAME *)a, NULL, NULL, NULL);
 702 }
 703
 704 STACK_OF(X509_NAME) *SSL_load_client_CA_file_ex(const char *file,
 705                                                 OSSL_LIB_CTX *libctx,
 706                                                 const char *propq)
 707 {
 708     BIO *in = BIO_new(BIO_s_file());
 709     X509 *x = NULL;
 710     X509_NAME *xn = NULL;
 711     STACK_OF(X509_NAME) *ret = NULL;
 712     LHASH_OF(X509_NAME) *name_hash = lh_X509_NAME_new(xname_hash, xname_cmp);
 713     OSSL_LIB_CTX *prev_libctx = NULL;
 714
 715     if (name_hash == NULL) {
 716         ERR_raise(ERR_LIB_SSL, ERR_R_CRYPTO_LIB);
 717         goto err;
 718     }
 719     if (in == NULL) {
 720         ERR_raise(ERR_LIB_SSL, ERR_R_BIO_LIB);
 721         goto err;
 722     }
 723
 724     x = X509_new_ex(libctx, propq);
 725     if (x == NULL) {
 726         ERR_raise(ERR_LIB_SSL, ERR_R_X509_LIB);
 727         goto err;
 728     }
 729     if (BIO_read_filename(in, file) <= 0)
 730         goto err;
 731
 732     /* Internally lh_X509_NAME_retrieve() needs the libctx to retrieve SHA1 */
 733     prev_libctx = OSSL_LIB_CTX_set0_default(libctx);
 734     for (;;) {
 735         if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
 736             break;
 737         if (ret == NULL) {
 738             ret = sk_X509_NAME_new_null();
 739             if (ret == NULL) {
 740                 ERR_raise(ERR_LIB_SSL, ERR_R_CRYPTO_LIB);
 741                 goto err;
 742             }
 743         }
 744         if ((xn = X509_get_subject_name(x)) == NULL)
 745             goto err;
 746         /* check for duplicates */
 747         xn = X509_NAME_dup(xn);
 748         if (xn == NULL)
 749             goto err;
 750         if (lh_X509_NAME_retrieve(name_hash, xn) != NULL) {
 751             /* Duplicate. */
 752             X509_NAME_free(xn);
 753             xn = NULL;
 754         } else {
 755             lh_X509_NAME_insert(name_hash, xn);
 756             if (!sk_X509_NAME_push(ret, xn))
 757                 goto err;
 758         }
 759     }
 760     goto done;
 761
 762  err:
 763     X509_NAME_free(xn);
 764     sk_X509_NAME_pop_free(ret, X509_NAME_free);
 765     ret = NULL;
 766  done:
 767     /* restore the old libctx */
 768     OSSL_LIB_CTX_set0_default(prev_libctx);
 769     BIO_free(in);
 770     X509_free(x);
 771     lh_X509_NAME_free(name_hash);
 772     if (ret != NULL)
 773         ERR_clear_error();
 774     return ret;
 775 }
 776
 777 STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file)
 778 {
 779     return SSL_load_client_CA_file_ex(file, NULL, NULL);
 780 }
 781
 782 int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 783                                         const char *file)
 784 {
 785     BIO *in;
 786     X509 *x = NULL;
 787     X509_NAME *xn = NULL;
 788     int ret = 1;
 789     int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b);
 790
 791     oldcmp = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp);
 792
 793     in = BIO_new(BIO_s_file());
 794
 795     if (in == NULL) {
 796         ERR_raise(ERR_LIB_SSL, ERR_R_BIO_LIB);
 797         goto err;
 798     }
 799
 800     if (BIO_read_filename(in, file) <= 0)
 801         goto err;
 802
 803     for (;;) {
 804         if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
 805             break;
 806         if ((xn = X509_get_subject_name(x)) == NULL)
 807             goto err;
 808         xn = X509_NAME_dup(xn);
 809         if (xn == NULL)
 810             goto err;
 811         if (sk_X509_NAME_find(stack, xn) >= 0) {
 812             /* Duplicate. */
 813             X509_NAME_free(xn);
 814         } else if (!sk_X509_NAME_push(stack, xn)) {
 815             X509_NAME_free(xn);
 816             goto err;
 817         }
 818     }
 819
 820     ERR_clear_error();
 821     goto done;
 822
 823  err:
 824     ret = 0;
 825  done:
 826     BIO_free(in);
 827     X509_free(x);
 828     (void)sk_X509_NAME_set_cmp_func(stack, oldcmp);
 829     return ret;
 830 }
 831
 832 int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 833                                        const char *dir)
 834 {
 835     OPENSSL_DIR_CTX *d = NULL;
 836     const char *filename;
 837     int ret = 0;
 838
 839     /* Note that a side effect is that the CAs will be sorted by name */
 840
 841     while ((filename = OPENSSL_DIR_read(&d, dir))) {
 842         char buf[1024];
 843         int r;
 844         struct stat st;
 845
 846         if (strlen(dir) + strlen(filename) + 2 > sizeof(buf)) {
 847             ERR_raise(ERR_LIB_SSL, SSL_R_PATH_TOO_LONG);
 848             goto err;
 849         }
 850 #ifdef OPENSSL_SYS_VMS
 851         r = BIO_snprintf(buf, sizeof(buf), "%s%s", dir, filename);
 852 #else
 853         r = BIO_snprintf(buf, sizeof(buf), "%s/%s", dir, filename);
 854 #endif
 855         /* Skip subdirectories */
 856         if (!stat(buf, &st) && S_ISDIR(st.st_mode))
 857             continue;
 858         if (r <= 0 || r >= (int)sizeof(buf))
 859             goto err;
 860         if (!SSL_add_file_cert_subjects_to_stack(stack, buf))
 861             goto err;
 862     }
 863
 864     if (errno) {
 865         ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
 866                        "calling OPENSSL_dir_read(%s)", dir);
 867         ERR_raise(ERR_LIB_SSL, ERR_R_SYS_LIB);
 868         goto err;
 869     }
 870
 871     ret = 1;
 872
 873  err:
 874     if (d)
 875         OPENSSL_DIR_end(&d);
 876
 877     return ret;
 878 }
 879
 880 static int add_uris_recursive(STACK_OF(X509_NAME) *stack,
 881                               const char *uri, int depth)
 882 {
 883     int ok = 1;
 884     OSSL_STORE_CTX *ctx = NULL;
 885     X509 *x = NULL;
 886     X509_NAME *xn = NULL;
 887
 888     if ((ctx = OSSL_STORE_open(uri, NULL, NULL, NULL, NULL)) == NULL)
 889         goto err;
 890
 891     while (!OSSL_STORE_eof(ctx) && !OSSL_STORE_error(ctx)) {
 892         OSSL_STORE_INFO *info = OSSL_STORE_load(ctx);
 893         int infotype = info == 0 ? 0 : OSSL_STORE_INFO_get_type(info);
 894
 895         if (info == NULL)
 896             continue;
 897
 898         if (infotype == OSSL_STORE_INFO_NAME) {
 899             /*
 900              * This is an entry in the "directory" represented by the current
 901              * uri.  if |depth| allows, dive into it.
 902              */
 903             if (depth > 0)
 904                 ok = add_uris_recursive(stack, OSSL_STORE_INFO_get0_NAME(info),
 905                                         depth - 1);
 906         } else if (infotype == OSSL_STORE_INFO_CERT) {
 907             if ((x = OSSL_STORE_INFO_get0_CERT(info)) == NULL
 908                 || (xn = X509_get_subject_name(x)) == NULL
 909                 || (xn = X509_NAME_dup(xn)) == NULL)
 910                 goto err;
 911             if (sk_X509_NAME_find(stack, xn) >= 0) {
 912                 /* Duplicate. */
 913                 X509_NAME_free(xn);
 914             } else if (!sk_X509_NAME_push(stack, xn)) {
 915                 X509_NAME_free(xn);
 916                 goto err;
 917             }
 918         }
 919
 920         OSSL_STORE_INFO_free(info);
 921     }
 922
 923     ERR_clear_error();
 924     goto done;
 925
 926  err:
 927     ok = 0;
 928  done:
 929     OSSL_STORE_close(ctx);
 930
 931     return ok;
 932 }
 933
 934 int SSL_add_store_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 935                                          const char *store)
 936 {
 937     int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b)
 938         = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp);
 939     int ret = add_uris_recursive(stack, store, 1);
 940
 941     (void)sk_X509_NAME_set_cmp_func(stack, oldcmp);
 942     return ret;
 943 }
 944
 945 /* Build a certificate chain for current certificate */
 946 int ssl_build_cert_chain(SSL_CONNECTION *s, SSL_CTX *ctx, int flags)
 947 {
 948     CERT *c = s != NULL ? s->cert : ctx->cert;
 949     CERT_PKEY *cpk = c->key;
 950     X509_STORE *chain_store = NULL;
 951     X509_STORE_CTX *xs_ctx = NULL;
 952     STACK_OF(X509) *chain = NULL, *untrusted = NULL;
 953     X509 *x;
 954     SSL_CTX *real_ctx = (s == NULL) ? ctx : SSL_CONNECTION_GET_CTX(s);
 955     int i, rv = 0;
 956
 957     if (cpk->x509 == NULL) {
 958         ERR_raise(ERR_LIB_SSL, SSL_R_NO_CERTIFICATE_SET);
 959         goto err;
 960     }
 961     /* Rearranging and check the chain: add everything to a store */
 962     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK) {
 963         chain_store = X509_STORE_new();
 964         if (chain_store == NULL)
 965             goto err;
 966         for (i = 0; i < sk_X509_num(cpk->chain); i++) {
 967             x = sk_X509_value(cpk->chain, i);
 968             if (!X509_STORE_add_cert(chain_store, x))
 969                 goto err;
 970         }
 971         /* Add EE cert too: it might be self signed */
 972         if (!X509_STORE_add_cert(chain_store, cpk->x509))
 973             goto err;
 974     } else {
 975         if (c->chain_store != NULL)
 976             chain_store = c->chain_store;
 977         else
 978             chain_store = real_ctx->cert_store;
 979
 980         if (flags & SSL_BUILD_CHAIN_FLAG_UNTRUSTED)
 981             untrusted = cpk->chain;
 982     }
 983
 984     xs_ctx = X509_STORE_CTX_new_ex(real_ctx->libctx, real_ctx->propq);
 985     if (xs_ctx == NULL) {
 986         ERR_raise(ERR_LIB_SSL, ERR_R_X509_LIB);
 987         goto err;
 988     }
 989     if (!X509_STORE_CTX_init(xs_ctx, chain_store, cpk->x509, untrusted)) {
 990         ERR_raise(ERR_LIB_SSL, ERR_R_X509_LIB);
 991         goto err;
 992     }
 993     /* Set suite B flags if needed */
 994     X509_STORE_CTX_set_flags(xs_ctx,
 995                              c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS);
 996
 997     i = X509_verify_cert(xs_ctx);
 998     if (i <= 0 && flags & SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR) {
 999         if (flags & SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR)
1000             ERR_clear_error();
1001         i = 1;
1002         rv = 2;
1003     }
1004     if (i > 0)
1005         chain = X509_STORE_CTX_get1_chain(xs_ctx);
1006     if (i <= 0) {
1007         i = X509_STORE_CTX_get_error(xs_ctx);
1008         ERR_raise_data(ERR_LIB_SSL, SSL_R_CERTIFICATE_VERIFY_FAILED,
1009                        "Verify error:%s", X509_verify_cert_error_string(i));
1010
1011         goto err;
1012     }
1013     /* Remove EE certificate from chain */
1014     x = sk_X509_shift(chain);
1015     X509_free(x);
1016     if (flags & SSL_BUILD_CHAIN_FLAG_NO_ROOT) {
1017         if (sk_X509_num(chain) > 0) {
1018             /* See if last cert is self signed */
1019             x = sk_X509_value(chain, sk_X509_num(chain) - 1);
1020             if (X509_get_extension_flags(x) & EXFLAG_SS) {
1021                 x = sk_X509_pop(chain);
1022                 X509_free(x);
1023             }
1024         }
1025     }
1026     /*
1027      * Check security level of all CA certificates: EE will have been checked
1028      * already.
1029      */
1030     for (i = 0; i < sk_X509_num(chain); i++) {
1031         x = sk_X509_value(chain, i);
1032         rv = ssl_security_cert(s, ctx, x, 0, 0);
1033         if (rv != 1) {
1034             ERR_raise(ERR_LIB_SSL, rv);
1035             OSSL_STACK_OF_X509_free(chain);
1036             rv = 0;
1037             goto err;
1038         }
1039     }
1040     OSSL_STACK_OF_X509_free(cpk->chain);
1041     cpk->chain = chain;
1042     if (rv == 0)
1043         rv = 1;
1044  err:
1045     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK)
1046         X509_STORE_free(chain_store);
1047     X509_STORE_CTX_free(xs_ctx);
1048
1049     return rv;
1050 }
1051
1052 int ssl_cert_set_cert_store(CERT *c, X509_STORE *store, int chain, int ref)
1053 {
1054     X509_STORE **pstore;
1055     if (chain)
1056         pstore = &c->chain_store;
1057     else
1058         pstore = &c->verify_store;
1059     X509_STORE_free(*pstore);
1060     *pstore = store;
1061     if (ref && store)
1062         X509_STORE_up_ref(store);
1063     return 1;
1064 }
1065
1066 int ssl_cert_get_cert_store(CERT *c, X509_STORE **pstore, int chain)
1067 {
1068     *pstore = (chain ? c->chain_store : c->verify_store);
1069     return 1;
1070 }
1071
1072 int ssl_get_security_level_bits(const SSL *s, const SSL_CTX *ctx, int *levelp)
1073 {
1074     int level;
1075     /*
1076      * note that there's a corresponding minbits_table
1077      * in crypto/x509/x509_vfy.c that's used for checking the security level
1078      * of RSA and DSA keys
1079      */
1080     static const int minbits_table[5 + 1] = { 0, 80, 112, 128, 192, 256 };
1081
1082     if (ctx != NULL)
1083         level = SSL_CTX_get_security_level(ctx);
1084     else
1085         level = SSL_get_security_level(s);
1086
1087     if (level > 5)
1088         level = 5;
1089     else if (level < 0)
1090         level = 0;
1091
1092     if (levelp != NULL)
1093         *levelp = level;
1094
1095     return minbits_table[level];
1096 }
1097
1098 static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
1099                                          int op, int bits, int nid, void *other,
1100                                          void *ex)
1101 {
1102     int level, minbits, pfs_mask;
1103     const SSL_CONNECTION *sc;
1104
1105     minbits = ssl_get_security_level_bits(s, ctx, &level);
1106
1107     if (level == 0) {
1108         /*
1109          * No EDH keys weaker than 1024-bits even at level 0, otherwise,
1110          * anything goes.
1111          */
1112         if (op == SSL_SECOP_TMP_DH && bits < 80)
1113             return 0;
1114         return 1;
1115     }
1116     switch (op) {
1117     case SSL_SECOP_CIPHER_SUPPORTED:
1118     case SSL_SECOP_CIPHER_SHARED:
1119     case SSL_SECOP_CIPHER_CHECK:
1120         {
1121             const SSL_CIPHER *c = other;
1122             /* No ciphers below security level */
1123             if (bits < minbits)
1124                 return 0;
1125             /* No unauthenticated ciphersuites */
1126             if (c->algorithm_auth & SSL_aNULL)
1127                 return 0;
1128             /* No MD5 mac ciphersuites */
1129             if (c->algorithm_mac & SSL_MD5)
1130                 return 0;
1131             /* SHA1 HMAC is 160 bits of security */
1132             if (minbits > 160 && c->algorithm_mac & SSL_SHA1)
1133                 return 0;
1134             /* Level 3: forward secure ciphersuites only */
1135             pfs_mask = SSL_kDHE | SSL_kECDHE | SSL_kDHEPSK | SSL_kECDHEPSK;
1136             if (level >= 3 && c->min_tls != TLS1_3_VERSION &&
1137                                !(c->algorithm_mkey & pfs_mask))
1138                 return 0;
1139             break;
1140         }
1141     case SSL_SECOP_VERSION:
1142         if ((sc = SSL_CONNECTION_FROM_CONST_SSL(s)) == NULL)
1143             return 0;
1144         if (!SSL_CONNECTION_IS_DTLS(sc)) {
1145             /* SSLv3, TLS v1.0 and TLS v1.1 only allowed at level 0 */
1146             if (nid <= TLS1_1_VERSION && level > 0)
1147                 return 0;
1148         } else {
1149             /* DTLS v1.0 only allowed at level 0 */
1150             if (DTLS_VERSION_LT(nid, DTLS1_2_VERSION) && level > 0)
1151                 return 0;
1152         }
1153         break;
1154
1155     case SSL_SECOP_COMPRESSION:
1156         if (level >= 2)
1157             return 0;
1158         break;
1159     case SSL_SECOP_TICKET:
1160         if (level >= 3)
1161             return 0;
1162         break;
1163     default:
1164         if (bits < minbits)
1165             return 0;
1166     }
1167     return 1;
1168 }
1169
1170 int ssl_security(const SSL_CONNECTION *s, int op, int bits, int nid, void *other)
1171 {
1172     return s->cert->sec_cb(SSL_CONNECTION_GET_SSL(s), NULL, op, bits, nid,
1173                            other, s->cert->sec_ex);
1174 }
1175
1176 int ssl_ctx_security(const SSL_CTX *ctx, int op, int bits, int nid, void *other)
1177 {
1178     return ctx->cert->sec_cb(NULL, ctx, op, bits, nid, other,
1179                              ctx->cert->sec_ex);
1180 }
1181
1182 int ssl_cert_lookup_by_nid(int nid, size_t *pidx, SSL_CTX *ctx)
1183 {
1184     size_t i;
1185
1186     for (i = 0; i < OSSL_NELEM(ssl_cert_info); i++) {
1187         if (ssl_cert_info[i].nid == nid) {
1188             *pidx = i;
1189             return 1;
1190         }
1191     }
1192     for (i = 0; i < ctx->sigalg_list_len; i++) {
1193         if (ctx->ssl_cert_info[i].nid == nid) {
1194             *pidx = SSL_PKEY_NUM + i;
1195             return 1;
1196         }
1197     }
1198     return 0;
1199 }
1200
1201 SSL_CERT_LOOKUP *ssl_cert_lookup_by_pkey(const EVP_PKEY *pk, size_t *pidx, SSL_CTX *ctx)
1202 {
1203     size_t i;
1204
1205     /* check classic pk types */
1206     for (i = 0; i < OSSL_NELEM(ssl_cert_info); i++) {
1207         SSL_CERT_LOOKUP *tmp_lu = &ssl_cert_info[i];
1208
1209         if (EVP_PKEY_is_a(pk, OBJ_nid2sn(tmp_lu->nid))
1210             || EVP_PKEY_is_a(pk, OBJ_nid2ln(tmp_lu->nid))) {
1211             if (pidx != NULL)
1212                 *pidx = i;
1213             return tmp_lu;
1214         }
1215     }
1216     /* check provider-loaded pk types */
1217     for (i = 0; ctx->sigalg_list_len; i++) {
1218         SSL_CERT_LOOKUP *tmp_lu = &(ctx->ssl_cert_info[i]);
1219
1220         if (EVP_PKEY_is_a(pk, OBJ_nid2sn(tmp_lu->nid))
1221             || EVP_PKEY_is_a(pk, OBJ_nid2ln(tmp_lu->nid))) {
1222             if (pidx != NULL)
1223                 *pidx = SSL_PKEY_NUM + i;
1224             return &ctx->ssl_cert_info[i];
1225         }
1226     }
1227
1228     return NULL;
1229 }
1230
1231 SSL_CERT_LOOKUP *ssl_cert_lookup_by_idx(size_t idx, SSL_CTX *ctx)
1232 {
1233     if (idx >= (OSSL_NELEM(ssl_cert_info) + ctx->sigalg_list_len))
1234         return NULL;
1235     else if (idx >= (OSSL_NELEM(ssl_cert_info)))
1236         return &(ctx->ssl_cert_info[idx - SSL_PKEY_NUM]);
1237     return &ssl_cert_info[idx];
1238 }